Ladder



FIG. 1 illustrates a front right perspective view of a ladder showing mynew design;

FIG. 2 illustrates a front view of a ladder showing my new design;

FIG. 3 illustrates a top perspective view of a ladder showing my newdesign;

FIG. 4 illustrates a right side view of a ladder showing my new design,the left side view being a mirror image of the right side view;

FIG. 5 illustrates a bottom view of a ladder showing my new design; and,

FIG. 6 illustrates a rear view of a ladder showing my new design.

I claim the ornamental design for a ladder, as shown and described.